CTAC means Center for Army Tactics formerly CAT and Department of TACTICS at CGSC in Military
Similar to CTAC
13AD - 13th Airborne Division13B - Military Occupational Specialty code for Cannon Artilleryman
147FA - 147th Field Artillery Regiment
15MG - 15 Militia Group
17AD - 17th Airborne Division
180FA - 180th Field Artillery Regiment
189FA - 189th Field Artillery Regiment
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